The Giants may not make big headlines in free agency but they are moving quickly. They are bringing in tight end Martellus Bennett for a visit and it might not take long for the former Cowboys player to join a team in need of an athletic tight end.

Bennett, 25, is likely the tight end the Giants have targeted; he has a big upside and at 6-6 and 270 pounds is a big body and solid athlete. He’s also not done very much in his four years with the Cowboys since he was a second-round draft pick in 2008 out of Texas A&M.

Bennett had 17 receptions for 144 yards last season and in four years has 85 receptions for 846 yards. All four of his touchdowns came as a rookie in 2008.

The need for at least one tight end came out of the Super Bowl XLVI victory over the Patriots. Jake Ballard and Travis Beckum went down in that game with torn ACLs and the subsequent reconstructive knee surgeries puts their 2012 seasons in doubt.

Playing behind Jason Witten, Bennett never was able to flourish in the Cowboys offense, but the Giants play against him twice a season and certainly have scouted him extensively.

Bennett recently went on Pro Football Talk Live and said he desperately wants to be a go-to target in an offense.

“I want to be the No. 1 guy,’’ Bennett said. “I feel like I’m a 60-catch-plus guy so I want to be in a system where I could do [that].’’

The Giants on the first day of free agency signed three cornerbacks, most notably Terrell Thomas, who did not hit the open market, agreeing to terms before the 4 p.m. start of free agency. Also re-signed were Michael Coe and Justin Tryon, cornerbacks who spent last season with the Giants before injuries landed them on injured reserve.

The Giants also signed offensive tackle Joel Reinders and tight end Larry Donnell.

Coe, entering his sixth NFL season, third with the Giants, played in the first 10 games last season before a shoulder injury ended his season. Tryon, entering his fifth NFL season, joined the Giants last October after he was released by the Colts. He played in three games before breaking his arm against the Dolphins on Oct. 30.

The 6-8, 317-pound Reinders was in training camp with the Browns in 2010. The product of the University of Waterloo in Canada did not play football last year. Donnell, a 6-6, 269-pound tight end, played at Grambling State.